HM 17. Part X: Meter Proving. Section 8: Calibration of additive injection systems for road loading gantries

Overview:

In recent years there has been a marked increase in requirements to inject performance-enhancing additives into automotive fuels at road loading gantries. In addition, the development of terminal sharing arrangements has resulted in many loading gantries having to cater for more than one marketing operator. These factors in combination have led to the installation of multiple additive injection systems at many terminals.

Additive injection systems require segregated storage, pumped feed systems, metering equipment and line injection facilities for each type of additive and each company fuel specification. A demand for accurate reconciliation and stock control has thereby emerged. Earlier system designs comprised meter-driven, mechanical injector pumps for dedicated additives. The equipment was checked as part of the meter proving operation. However, such designs have been superseded by stand-alone additive systems that require calibration and maintenance in their own right.

These developments have led to a need for industry guidelines for the operation, maintenance and calibration of additive systems. This document addresses that need. Since each additive injection system is principally directed at a single company’s own-brand products, the scope of the guidelines does not fall within the normal parameters of a Code of Practice for industry.

The document is therefore issued as Guidance and covers pulse-operated shuttle and metered-shot injection systems used for the injection of proprietary additives into automotive and other white oil fuels at loading gantries.